<template>
  <!-- 面包屑组件 -->
  <sec-breadcrumb
    class="app-breadcrumb"
    separator="/"
  >
    <transition-group name="breadcrumb">
      <sec-breadcrumb-item
        v-for="(item, index) in levelList"
        v-show="index === levelList.length - 1"
        :key="item.path"
      >
        <a @click.prevent="handleLink(item)">{{ item.name }}</a>
      </sec-breadcrumb-item>

    </transition-group>
  </sec-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'

export default {
  data() {
    return {
      levelList: null
    }
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith('/redirect/')) {
        return
      }
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      this.levelList = this.$route.matched.filter(
        (item) => item.name && item.meta.breadcrumb !== false
      )
    },
    isDashboard(route) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 16px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
  .el-breadcrumb__item:last-child a {
    font-size: 16px;
    color: #262626;
    font-weight: 500 !important;
  }
}
</style>
